I'd be weary of what I got for free on Craig's List. Check over the boa very well, you don't want a Boa that's going to need more vet bills than buying one would cost.

A Suriname should look like this:


You will need to either buy a cage, I'd say give Jeff a call www.boaphile.com, or build one. You might need to build something, since Jeff has a really good waiting list. Also, check out reptile basics, I heard his are pretty nice too. You will need at least a 4ftx2ftx1ft cage, and preferably a 6ft x 2ft x 2ft for a long healthy home. Good luck!